Deleted user still in Zoho Mail Add-on Users

Deleted user still in Zoho Mail Add-on Users

Hi,
I've deleted an user, it's no longer in the users list but it's still in the Zoho Mail Add-on Users.
Because of that, I still can see it in the ComboBox which display e-mails interractions with a client.
How can I definitly remove this user from everywhere in the Zoho CRM please ?